CN100457384C - Method for soldering external surface of steam admission intubation for main steam of steam turbine by using stellite - Google Patents
Method for soldering external surface of steam admission intubation for main steam of steam turbine by using stellite Download PDFInfo
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- CN100457384C CN100457384C CNB2005100105288A CN200510010528A CN100457384C CN 100457384 C CN100457384 C CN 100457384C CN B2005100105288 A CNB2005100105288 A CN B2005100105288A CN 200510010528 A CN200510010528 A CN 200510010528A CN 100457384 C CN100457384 C CN 100457384C
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Abstract
A technology for argon arc welding of Stellite alloy on the external surface of master steam inlet tube for turbine includes such steps as turning on the surface of raw tube, penetrant inspection, preheating, stacking Stellite alloy on its external surface, argon arc welding, heat treating for removing stress, turning and penetrant inspection. Its advantages are high resistance to corrosion, flushing and vibration.
Description
Technical field
The present invention relates to the welding method of steam turbine main steam inlet sleeve outer surface.
Background technology
In the steam turbine industry, supercritical unit main steam inlet sleeve is worked under supercritical behavior (566 ℃ of operating temperatures, pressure 24.2MPa) for a long time, owing to be subjected to washing away and shock effect of high velocity air, causes damage in intubate and preceding cylinder connecting place easily.
Summary of the invention
The present invention is in order to solve existing supercritical unit main steam inlet sleeve outer surface and to be subjected to washing away of high velocity air and shaking, make the damaged bad problem of steam turbine main steam inlet sleeve and preceding cylinder connecting place, proposed a kind of method with stellite welding steam turbine main steam inlet sleeve outer surface, the concrete technical scheme that addresses this problem is as follows:
The present invention is as follows with the method step of stellite welding steam turbine main steam inlet sleeve outer surface:
Step 1, steam turbine main steam inlet sleeve outer surface is carried out turning processing by designing requirement;
Step 2, will carry out dye penetrant inspection, the defective of the welding quality of determining to have no effect through the steam turbine main steam inlet sleeve after the step 1 processing;
Step 3, to carry out preheating through the steam turbine main steam inlet sleeve of step 2, when reaching 400～700 ℃ of scopes, temperature applies stellite at steam turbine main steam inlet sleeve outer surface heap, adopt argon arc welding method to weld, welding current is 220～320A, argon flow amount is 24～28L/min, positioner speed is 7r/min, wire feed rate was 28～48 (showing digital control by automatic argon arc welder), track pitch 10.0mm, welding zone is that steam turbine main steam inlet sleeve lower end length is the outer round surface of 540mm, welding zone is welded, will divide two-layer carrying out during welding, the interlayer welding temperature is controlled at 400～700 ℃;
Step 4, will carry out destressing heat treatment, when steam turbine main steam inlet sleeve is warming up to 530～600 ℃, be incubated 1～4 hour through the steam turbine main steam inlet sleeve of step 3 postwelding; Again with per hour 25 ℃ be cooled to 180～250 ℃, be incubated 20～40 minutes; Again with per hour 55 ℃ be warming up to 630～700 ℃, be incubated 3～6 hours; Again with per hour 25 ℃ be cooled to 80～150 ℃, be incubated after 20～40 minutes, with per hour 55 ℃ be warming up to 630～700 ℃, be incubated 3～6 hours; Again with per hour 25 ℃ be cooled to 80～150 ℃, be incubated 20～40 minutes;
Step 5, will carry out turning processing by the size of designing requirement through the steam turbine main steam inlet sleeve after the step 4 heat treatment;
Step 6, will carry out dye penetrant inspection through the steam turbine main steam inlet sleeve after the step 5 turning processing.
The present invention adopts the outer round surface welding stellite of argon arc welding method to steam turbine main steam inlet sleeve, the corrosion resistance of steam turbine main steam inlet sleeve product, anti-ability of washing away with anti-vibration have been improved significantly, prolong the service life of steam turbine main steam inlet sleeve, reduced cost.
Description of drawings
Fig. 1 is a steam turbine main steam inlet sleeve welding front cross sectional view in the embodiment one, and Fig. 2 is the curve map of heat treatment process in the embodiment two, and Fig. 3 is the cutaway view behind the steam turbine main steam inlet sleeve welding stellite in the embodiment one.
The specific embodiment
The specific embodiment one: present embodiment is realized by the following step with the method for stellite welding steam turbine main steam inlet sleeve outer surface:
Step 1, steam turbine main steam inlet sleeve (material 1Cr9MoVNbN) outer surface is carried out turning processing by the designing requirement (see figure 1);
Step 2, will carry out dye penetrant inspection, the defective of the welding quality of determining to have no effect through the steam turbine main steam inlet sleeve after the step 1 processing;
Step 3, to carry out preheating through the steam turbine main steam inlet sleeve of step 2, when reaching 400～700 ℃ of scopes, preheat temperature applies stellite (chemical composition of stellite sees Table 1) at steam turbine main steam inlet sleeve outer round surface heap, adopt argon arc welding method to weld, welding current is 220～320A, argon flow amount is 24～28L/min, positioner speed is 7r/min, wire feed rate was 28～48 (showing digital control by automatic argon arc welder), track pitch 10.0mm, welding zone is that steam turbine main steam inlet sleeve lower end length is the outer round surface of 540mm, welding zone is welded, weld two-layer carrying out of time-division, because of stellite once can not be piled too much deposited, the interlayer welding temperature is controlled at 400～700 ℃, operation is careful during the welding ground floor, adopt little standard, reduce the fusion penetration of parent metal as far as possible, the welding sermon evenly, seamlessly transit, by the design size welding, note strengthening self check in the welding process, the discovery defective is in time removed, repair, finally make steam turbine main steam inlet sleeve outer round surface weld the stellite of a layer thickness greater than 1mm; To the purpose that steam turbine main steam inlet sleeve carries out preheating, be in order to prevent that overlay and parent metal from cracking on the one hand, be in order to prevent to increase the fusion penetration of parent metal, to reduce dilution rate on the other hand;
Step 4, will carry out destressing heat treatment, when steam turbine main steam inlet sleeve is warming up to 530～600 ℃, be incubated 1～4 hour through the steam turbine main steam inlet sleeve of step 3 postwelding; Again with per hour 25 ℃ be cooled to 180～250 ℃, be incubated 20～40 minutes; Again with per hour 55 ℃ be warming up to 630～700 ℃, be incubated 3～6 hours; Again with per hour 25 ℃ be cooled to 80～150 ℃, be incubated 20～40 minutes; Again with per hour 55 ℃ be warming up to 630～700 ℃, be incubated 3～6 hours; Again with per hour 25 ℃ be cooled to 80～150 ℃, be incubated 20～40 minutes.The temper of postwelding not only plays the removal welding stress, prevent the effect that weld crack produces, simultaneously heap coating metal and heat affected area all there is certain influence, promptly improved the heat affected area tissue, crystal grain thinning, reduce hardness, brought into play the precipitation strength characteristic of overlay cladding cobalt base hard alloy again, the more conventional temper of heap coating hardness is significantly improved;
Step 5, will be when the steam turbine main steam inlet sleeve after the step 4 heat treatment carry out turning and process most 1mm to the stellite of steam turbine main steam inlet sleeve outer round surface welding by the size (as Fig. 3) of designing requirement till;
Step 6, will carry out dye penetrant inspection through the steam turbine main steam inlet sleeve after the step 5 turning processing.
The specific embodiment two: the difference of the present embodiment and the specific embodiment one is the steam turbine main steam inlet sleeve through the step 3 postwelding is carried out destressing heat treatment, when steam turbine main steam inlet sleeve is warming up to 580 ℃, is incubated 2 hours; Again with per hour 25 ℃ be cooled to 230 ℃, be incubated 30 minutes; Again with per hour 55 ℃ be warming up to 680 ℃, be incubated 4 hours; Again with per hour 25 ℃ be cooled to 130 ℃, be incubated 30 minutes; Again with per hour 55 ℃ be warming up to 680 ℃, be incubated 4 hours; Again with per hour 25 ℃ be cooled to 130 ℃, be incubated 30 minutes (see figure 2)s.Other step is identical with the specific embodiment one.
The specific embodiment three: the difference of the present embodiment and the specific embodiment one is the steam turbine main steam inlet sleeve through the step 3 postwelding is carried out destressing heat treatment, when steam turbine main steam inlet sleeve is warming up to 530 ℃, is incubated 1 hour; Again with per hour 25 ℃ be cooled to 180 ℃, be incubated 20 minutes; Again with per hour 55 ℃ be warming up to 630 ℃, be incubated 3 hours; Again with per hour 25 ℃ be cooled to 80 ℃, be incubated 20 minutes; Again with per hour 55 ℃ be warming up to 630 ℃, be incubated 3 hours; Again with per hour 25 ℃ be cooled to 80 ℃, be incubated 20 minutes.Other step is identical with the specific embodiment one.
The specific embodiment four: the difference of the present embodiment and the specific embodiment one is the steam turbine main steam inlet sleeve through the step 3 postwelding is carried out destressing heat treatment, when steam turbine main steam inlet sleeve is warming up to 600 ℃, is incubated 3 hours; Again with per hour 25 ℃ be cooled to 250 ℃, be incubated 40 minutes; Again with per hour 55 ℃ be warming up to 700 ℃, be incubated 5 hours; Again with per hour 25 ℃ be cooled to 150 ℃, be incubated 40 minutes; Again with per hour 55 ℃ be warming up to 700 ℃, be incubated 5 hours; Again with per hour 25 ℃ be cooled to 150 ℃, be incubated 40 minutes.Other step is identical with the specific embodiment one.
The chemical composition of stellite sees Table 1:
Table 1 weight %
| The trade mark | C | Mn | W | Ni | Cr | Mo | Fe | Si | Co |
| Stellite | 0.9～1.4 | ≤1.0 | 3.0～6.0 | 2.0～3.0 | 26.0～32.0 | ≤1.0 | ≤3.0 | 0.4～2.0 | Surplus |
Claims (4)
1, with the method for stellite welding steam turbine main steam inlet sleeve outer surface, it is characterized in that the step of this method is as follows:
Step 1, steam turbine main steam inlet sleeve outer surface is carried out turning processing by designing requirement;
Step 2, will carry out dye penetrant inspection, the defective of the welding quality of determining to have no effect through the steam turbine main steam inlet sleeve after the step 1 processing;
Step 3, to carry out preheating through the steam turbine main steam inlet sleeve of step 2, when reaching 400～700 ℃ of scopes, temperature applies stellite at steam turbine main steam inlet sleeve outer surface heap, adopt argon arc welding method to weld, welding current is 220～320A, argon flow amount is 24～28L/min, positioner speed is 7r/min, wire feed rate be 28～48 show by automatic argon arc welder digital control, track pitch 10.0mm, welding zone is that steam turbine main steam inlet sleeve lower end length is the outer round surface of 540mm, welding zone is welded, will divide two-layer carrying out during welding, the interlayer welding temperature is controlled at 400～700 ℃;
Step 4, will carry out destressing heat treatment, when steam turbine main steam inlet sleeve is warming up to 530～600 ℃, be incubated 1～4 hour through the steam turbine main steam inlet sleeve after the step 3 welding processing; Again with per hour 25 ℃ be cooled to 180～250 ℃, be incubated 20～40 minutes; Again with per hour 55 ℃ be warming up to 630～700 ℃, be incubated 3～6 hours; Again with per hour 25 ℃ be cooled to 80～150 ℃, be incubated after 20～40 minutes, again with per hour 55 ℃ be warming up to 630～700 ℃, be incubated 3～6 hours; Again with per hour 25 ℃ be cooled to 80～150 ℃, be incubated 20～40 minutes;
Step 5, will carry out turning processing by the size of designing requirement through the steam turbine main steam inlet sleeve after the step 4 destressing heat treatment;
Step 6, will carry out dye penetrant inspection through the steam turbine main steam inlet sleeve after the step 5 turning processing.
2, the method with stellite welding steam turbine main steam inlet sleeve outer surface according to claim 1 is characterized in that described steam turbine main steam inlet sleeve destressing heat treatment process is, when being warming up to 580 ℃, is incubated 2 hours; Again with per hour 25 ℃ be cooled to 230 ℃, be incubated 30 minutes; Again with per hour 55 ℃ be warming up to 680 ℃, be incubated 4 hours; Again with per hour 25 ℃ be cooled to 130 ℃, be incubated 30 minutes; Again with per hour 55 ℃ be warming up to 680 ℃, be incubated 4 hours; Again with per hour 25 ℃ be cooled to 130 ℃, be incubated 30 minutes.
3, the method with stellite welding steam turbine main steam inlet sleeve outer surface according to claim 1 is characterized in that described steam turbine main steam inlet sleeve destressing heat treatment process is, when being warming up to 530 ℃, is incubated 1 hour; Again with per hour 25 ℃ be cooled to 180 ℃, be incubated 20 minutes; Again with per hour 55 ℃ be warming up to 630 ℃, be incubated 3 hours; Again with per hour 25 ℃ be cooled to 80 ℃, be incubated 20 minutes; Again with per hour 55 ℃ be warming up to 630 ℃, be incubated 3 hours; Again with per hour 25 ℃ be cooled to 80 ℃, be incubated 20 minutes.
4, the method with stellite welding steam turbine main steam inlet sleeve outer surface according to claim 1 is characterized in that described steam turbine main steam inlet sleeve destressing heat treatment process is, when being warming up to 600 ℃, is incubated 3 hours; Again with per hour 25 ℃ be cooled to 250 ℃, be incubated 40 minutes; Again with per hour 55 ℃ be warming up to 700 ℃, be incubated 5 hours; Again with per hour 25 ℃ be cooled to 150 ℃, be incubated 40 minutes; Again with per hour 55 ℃ be warming up to 700 ℃, be incubated 5 hours; Again with per hour 25 ℃ be cooled to 150 ℃, be incubated 40 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100105288A CN100457384C (en) | 2005-11-11 | 2005-11-11 | Method for soldering external surface of steam admission intubation for main steam of steam turbine by using stellite |
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| CNB2005100105288A CN100457384C (en) | 2005-11-11 | 2005-11-11 | Method for soldering external surface of steam admission intubation for main steam of steam turbine by using stellite |
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| CN100457384C true CN100457384C (en) | 2009-02-04 |
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| CN102974917B (en) * | 2012-11-09 | 2015-03-18 | 哈尔滨汽轮机厂有限责任公司 | Stellite alloy bead weld method of gas turbine combustion chamber |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037475A (en) * | 1988-05-05 | 1989-11-29 | 西屋电气公司 | Controlled built-up welding reparation with improved turbine system and low-alloy steel steam-turbine parts of failure resistant rotors |
| CN1049701A (en) * | 1989-08-07 | 1991-03-06 | 西屋电气公司 | The method that applies erosion resistant surfaces to steam turbine components |
| JPH1177156A (en) * | 1997-09-10 | 1999-03-23 | Ishikawajima Harima Heavy Ind Co Ltd | High temperature mandrel in rolling equipment |
| CN1579694A (en) * | 2004-05-19 | 2005-02-16 | 哈尔滨汽轮机厂有限责任公司 | Steam turbine bulkhead electron-beam welding method |
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2005
- 2005-11-11 CN CNB2005100105288A patent/CN100457384C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037475A (en) * | 1988-05-05 | 1989-11-29 | 西屋电气公司 | Controlled built-up welding reparation with improved turbine system and low-alloy steel steam-turbine parts of failure resistant rotors |
| CN1049701A (en) * | 1989-08-07 | 1991-03-06 | 西屋电气公司 | The method that applies erosion resistant surfaces to steam turbine components |
| JPH1177156A (en) * | 1997-09-10 | 1999-03-23 | Ishikawajima Harima Heavy Ind Co Ltd | High temperature mandrel in rolling equipment |
| CN1579694A (en) * | 2004-05-19 | 2005-02-16 | 哈尔滨汽轮机厂有限责任公司 | Steam turbine bulkhead electron-beam welding method |
Non-Patent Citations (2)
| Title |
|---|
| 汽轮机叶片司太立合金高频钎焊工艺. 刘传波等.焊接，第8期. 2002 |
| 汽轮机叶片司太立合金高频钎焊工艺. 刘传波等.焊接，第8期. 2002 * |
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